Embryo cryopreservation
Embryos may be preserved through cryopreservation, generally at an embryogenesis stage corresponding to pre-implantation, that is, from fertilisation to the blastocyst stage. == Indications == Embryo cryopreservation is useful for leftover embryos after a cycle of in vitro fertilisation, as patients who fail to conceive may become pregnant using such embryos without having to go through a full IVF cycle.